List of fictional alien species: P

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Name	Source	Type
Paan'uri	Schlock Mercenary	Dark matter entities
Pah Wraith	Star Trek
Pak, a.k.a. Protectors	Larry Niven's Known Space books	Humanoid, with three distinct life stages. First stage: Child, Second Stage: Breeder (known on earth as Homo Erectus), Third Stage: Protector, (superintelligent, could not survive on earth)
Pakled	Star Trek
Parillatians	Utopia
Pascalenes	Utopia
Pascians	Battlelords of the 23rd Century
Peliar Zel	Star Trek
Pemalites	K. A. Applegate's Animorphs	Dog like aliens, extremely friendly
Pentapods	2300 AD
The People from the Home	The People (1972 film) and writings by Zenna Henderson	Very like Earth people, but have paranormal powers. Some came to live in small communities on Earth, after their own planet "the Home" was destroyed.
Pequeninos	Orson Scott Card's Speaker for the Dead
Petrosapien	Ben 10
Pfifltrig	C. S. Lewis' Ransom Trilogy
Pfhor	Marathon Trilogy
Phagors	Brian W. Aldiss's Heliconia series	Humanoid
Phalanx	Marvel Comics
Phentari	Battlelords of the 23rd Century
Phibians	Dune universe
Phleebhutinskis	Space Quest
Phosphorescent Maze Midgets	Bravest Warriors	Midgets that live in the Lavarynth.
Phtagurs	Metabarons
Pierson's Puppeteers	Larry Niven's Ringworld and Known Space series	three legs, armless, two manipulative heads, brain in torse. Evolved from herbivorous herd animals. Most technologically advanced species in Known Space.
Pilots	Farscape	Crustaceanoid
Pinkunz	Space Quest
Pisciss Volanns	Ben 10
Pkunk	Star Control	Toucan or dodo-like
Planet Jackers	Invader Zim	The Planet Jackers' planet orbits a dying sun so to keep it alive, they steal planets and hurl them into the sun to keep it burning.
P'lod	Weekly World News
Plookesians	Invader Zim	A peaceful race. Most notable of the Plookesians are Mooshy and Spoopty.
Ploxis	Star Control 3
Pnume	Jack Vance's Planet of Adventure Series	Insectoid.
Polymorph	Red Dwarf
Porquinhos	Orson Scott Card's Speaker for the Dead	Humanoid
Posleen	John Ringo's "Legacy of the Aldenata"
tans	The High Crusade
Prawns	District 9
Precursors	Halo	Highly advanced,15 meter tall, eurypterid beings
"Predator" aliens	Predator movie series
Primes	Peter F. Hamilton's "Commonwealth Saga"
Private Tamama	Sgt. Frog
Progenitors	David Brin's Uplift Universe
Promethians	Rifts role-playing game	Humanoid; formidable ancient race of mysterious origin; reside primarily on Phase World, center of the Three Galaxies; possess "phase" powers, enabling manipulation of physical and dimensional space; generally indifferent to anything that does not pose a threat to themselves or the cosmos as a whole.
Prophets (San 'Shyuum)	Halo
Prophets	Star Trek
Proteans	AdventureQuest	morphing metallic blobs
Protheans	Mass Effect
Protoss	StarCraft
Psilons	Master of Orion
Psirens	Red Dwarf	Shape Changing GELFs
Psychlos	Battlefield Earth	Humanoid
Psychons	Space: 1999	Humanoid with metamorphosis abilities, capable of "molecular transformation" into the form of organic material such as an animal or plant by knowing its molecular structure. This form can only be held for one hour and cannot change directly from one form to another.
Protoculture	Macross series
Polionation Tech	Sims 2
The Puppet Masters	Robert A. Heinlein book of the same name
Purple Aliens	It's Walky!
Pyrians	Gene Roddenberry's Andromeda	Methane breathing squid-like race
Pyronite	Ben 10
Pyroviles	Doctor Who	Humanoid
Python Lizards	Battlelords of the 23rd Century